Steam iron



FIG. 1 is a left side elevation view showing the new design and being a mirror image of the right side elevation view;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front perspective view thereof. 

The ornamental design for a steam iron, as shown and described. 